中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 力学研究所
  3. 中国科学院力学研究所
  4. 非线性力学国家重点实验室
Tuning chemical short-range order for simultaneous strength and toughness enhancement in NiCoCr medium-entropy alloys

文献类型：期刊论文

作者Shuang, Siyao6; Hu, Yanan6; Li, Xiaotao5; Yuan, Fuping4; Kang, Guozheng6; Gao, Huajian1,2,3; Zhang, Xu2,6; Yuan FP(袁福平)
刊名INTERNATIONAL JOURNAL OF PLASTICITY
出版日期2024-06-01
卷号177页码:17
关键词Toughness Short-range order Deformation mechanisms Medium -entropy alloy Molecular dynamics
ISSN号0749-6419
DOI10.1016/j.ijplas.2024.103980
通讯作者Gao, Huajian(gao.huajian@tsinghua.edu.cn) ; Zhang, Xu(xzhang@swjtu.edu.cn)
英文摘要The pursuit of enhancing strength and toughness remains a critical endeavor in the field of structural materials. This study explores two distinct strategies to overcome the traditional strength-toughness trade-off. Specifically, we manipulate the chemical composition and shortrange order (SRO) of the NiCoCr medium-entropy alloy, which has shown remarkable fracture toughness in recent experiments. Utilizing molecular dynamics simulations, we uncover nanoscale deformation mechanisms during crack propagation. Our findings highlight that optimizing the SRO degree leads to improvements in both atomic scale strength and toughness defined as the area underneath stress-strain curves from MD simulations. In contrast, a trade-off between strength and toughness persists when only manipulating the Ni content in the NiCoCr alloy. Based on the simulation results, we establish a strong correlation between toughness, strength, surface energies, and unstable stacking fault energies. These factors are influenced by the chemical composition and SROs in NiCoCr, with SROs acting as strong obstacles to dislocations, thereby contributing to additional strength. The exceptional toughness of NiCoCr with SRO arises from a synergy of intrinsic and extrinsic mechanisms, including dislocation glide, nanobridging during nanovoid coalescence and zigzag crack path. It is found that, in the presence of SRO, intrinsic toughening mechanisms usually associated with crack tip blunting and dissipation can also facilitate the onset of extrinsic toughening mechanisms of nanobridging and zig-zag crack path associated with nanovoid formation and coalescence. This study emphasizes the importance of tailoring SRO in designing materials with enhanced strength and toughness.
WOS关键词LATTICE DISTORTION ; BEHAVIOR
资助项目National Natural Science Foundation of China[12222209] ; National Natural Science Foundation of China[12192214] ; National Natural Science Foundation of China[11872321]
WOS研究方向Engineering ; Materials Science ; Mechanics
语种英语
WOS记录号WOS:001235841100001
资助机构National Natural Science Foundation of China
源URL[http://dspace.imech.ac.cn/handle/311007/95480]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Gao, Huajian; Zhang, Xu
作者单位1.Tsinghua Univ, Mechano X Inst, Dept Engn Mech, Appl Mech Lab, Beijing 100084, Peoples R China
2.Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore
3.ASTAR, Inst High Performance Comp, Singapore 138632, Singapore
4.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing, Peoples R China
5.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
6.Southwest Jiaotong Univ, Sch Mech & Aerosp, Appl Mech & Struct Safety Key Lab Sichuan Prov, Chengdu 610031, Peoples R China
推荐引用方式
GB/T 7714		 Shuang, Siyao,Hu, Yanan,Li, Xiaotao,et al. Tuning chemical short-range order for simultaneous strength and toughness enhancement in NiCoCr medium-entropy alloys[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2024,177:17.
APA Shuang, Siyao.,Hu, Yanan.,Li, Xiaotao.,Yuan, Fuping.,Kang, Guozheng.,...&袁福平.(2024).Tuning chemical short-range order for simultaneous strength and toughness enhancement in NiCoCr medium-entropy alloys.INTERNATIONAL JOURNAL OF PLASTICITY,177,17.
MLA Shuang, Siyao,et al."Tuning chemical short-range order for simultaneous strength and toughness enhancement in NiCoCr medium-entropy alloys".INTERNATIONAL JOURNAL OF PLASTICITY 177(2024):17.

入库方式： OAI收割

来源：力学研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。